(2) A person must not prescribe a restricted substance to which this clause applies unless the person holds an authority under Part 8 to prescribe the substance.

(3) This clause does not apply to the prescription of a substance:

(a) by a veterinary practitioner, or

(b) by a person who is authorised by the Permanent Head of the Commonwealth Department of Health to issue a prescription for the substance.

(4) A person who issues a prescription that authorises the supply of a substance to which this clause applies must ensure:

(a) in the case of a prescription that is issued in accordance with an authority under Part 8 that was granted to a particular person (by means of an instrument in writing given to the person), that the prescription is endorsed with the reference number shown on the authority, or

(b) in any other case, that the prescription is endorsed with words that clearly indicate that the prescription has been issued under this clause.